An Omnidirectional Modular Piezoelectric Energy Harvesting System and Its Working Method

Abstract

The present invention discloses an omnidirectional modular piezoelectric energy harvesting system and its working method, relating to the field of vibration energy harvesting; the system includes a plurality of fixedly connected piezoelectric energy harvesting modules; the piezoelectric energy harvesting module includes an energy harvesting module housing, an elastic telescopic component is arranged inside the energy harvesting module housing, the elastic telescopic component can move when the piezoelectric energy harvesting module is vibrated in any direction, a piezoelectric cantilever beam is arranged on the outer ring of the elastic telescopic component, the piezoelectric sheet of the piezoelectric cantilever beam can deform and generate electric energy when the elastic telescopic component moves, the piezoelectric cantilever beam is electrically connected with an energy harvesting circuit, and the energy harvesting circuit can transmit and store the electric energy generated by the piezoelectric cantilever beam. The present invention adopts the working method based on the above system, and a plurality of piezoelectric energy harvesting modules can be spliced and disassembled, realizing the modular design of the piezoelectric energy harvesting system, without affecting each other, and can work independently after being disassembled and assembled according to different environments.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration energy harvesting, and particularly to an omnidirectional modular piezoelectric energy harvesting system and its working method. Background Art

[0002] With the increasing maturity of wireless sensing and microelectronics technologies, wireless sensor networks have been widely applied in many fields such as environmental monitoring, aviation, and automobiles. Compared with other fields, the working environment in coal mines is relatively complex and changeable. If traditional monitoring methods are used to monitor and control equipment, it is difficult and the wiring layout is relatively complex. The development of wireless sensing and microelectromechanical technologies provides new ideas and methods for realizing the monitoring and control of the operation of coal mine electromechanical equipment. Currently, the wireless sensor networks in the working scenarios in coal mines mainly supply electrical energy to wireless sensor nodes by using traditional batteries. Due to the limitations of the volume and capacity of the batteries, the provided energy is very limited. In addition, frequently replacing the batteries will affect the operation of the equipment and generate additional workload, thus increasing the maintenance cost of the equipment. Currently, the energy forms that can solve the power supply problem of wireless sensor nodes include vibration energy, wind energy, solar energy, etc. In the case of coal mines, vibration occurs commonly during the operation of equipment, and the vibration energy is also relatively rich. Therefore, based on the vibration energy harvesting technology, various vibration energy harvesters have emerged.

[0003] The current vibration energy harvesters have a high degree of integration and a single structure, and cannot achieve modular design. Therefore, the energy harvesting efficiency is low, and the usage scenarios are limited and cannot adapt to the use in a small space. Summary of the Invention

[0004] The object of the present invention is to provide an omnidirectional modular piezoelectric energy harvesting system and its working method to solve the problems existing in the above-mentioned prior art. Multiple piezoelectric energy harvesting modules can be spliced and disassembled to achieve the modular design of the piezoelectric energy harvesting system, and they do not affect each other and can work independently after being disassembled and assembled according to different environments.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides an omnidirectional modular piezoelectric energy harvesting system, which includes a plurality of fixedly connected piezoelectric energy harvesting modules. The piezoelectric energy harvesting modules work independently and do not affect each other. The piezoelectric energy harvesting module includes an energy harvesting module housing. An elastic telescopic component is arranged in the energy harvesting module housing. The elastic telescopic component can move when the piezoelectric energy harvesting module is vibrated in any direction. A piezoelectric cantilever beam is arranged on the outer ring of the elastic telescopic component. The piezoelectric sheet of the piezoelectric cantilever beam can deform and generate electric energy when the elastic telescopic component moves. The piezoelectric cantilever beam is electrically connected to an energy harvesting circuit, and the energy harvesting circuit can transmit and store the electric energy generated by the piezoelectric cantilever beam. The present invention can realize the self-power supply of the mining wireless sensor node, which is of great significance to promoting the intelligent development of underground coal mine equipment. The energy harvesting module housing includes two end caps arranged symmetrically up and down. A column cylinder is fixedly arranged between the two end caps. An installation boss is respectively arranged on the inner surfaces of the two end caps. The two ends of the column cylinder are respectively inserted on the installation bosses of the two end caps. A wire passing hole is arranged on the side surface of the installation boss, and two wire outlet holes are arranged on the upper end cap. A connecting column is arranged at the center of the inner surface of the upper end cap, and a clamping boss is arranged at the center of the inner surface of the lower end cap. A clamping ring is arranged outside the clamping boss, and a lead outlet is arranged on the side surface of the clamping ring. The elastic telescopic component includes a telescopic spring central mass ball. A round hole is arranged at the top of the central mass ball. The lower end of the telescopic spring is fixedly connected to the central mass ball through the round hole, and the upper end of the telescopic spring is fixedly connected to the upper end cap through the connecting column. Through the combined design of the telescopic spring and the mass ball, the central mass ball can move in any direction under the action of the telescopic spring, so as to realize the collection of omnidirectional vibration energy. The end cap is a hexagonal prism structure, and the column cylinder is a hollow hexagonal prism structure. Lead grooves are arranged on the six inner surfaces of the column cylinder, and a trapezoidal slot is arranged on each of the three non-adjacent outer surfaces of the column cylinder. Through the cooperation of the trapezoidal insertion plate and the trapezoidal slot design, the restriction of the lateral movement of the piezoelectric energy harvesting module is realized. Two U-shaped clamping grooves are symmetrically arranged on both sides of the trapezoidal slot, and a trapezoidal insertion plate is arranged on each of the other three non-adjacent outer surfaces of the column cylinder. A strip-shaped fixed buckle is fixedly installed in the U-shaped clamping groove. The strip-shaped fixed buckle includes triangular straight hooks at both ends and a base boss in the middle. The triangular straight hooks and the base boss are integrally formed. Through the design of the integral formation of the triangular straight hooks and the base boss, the restriction of the longitudinal movement of the piezoelectric energy harvesting module is realized, and the base boss is fixedly clamped in the U-shaped clamping groove.

[0007] Optionally, the piezoelectric cantilever beams are circumferentially distributed around the central mass ball, so as to achieve omnidirectional energy harvesting. The piezoelectric cantilever beams include a combined beam and a piezoelectric sheet. The piezoelectric sheet is made of a relatively flexible MFC piezoelectric fiber composite material to improve the output of energy conversion. The combined beam includes a linear beam and an arc beam integrally formed. The piezoelectric sheet includes an upper surface piezoelectric sheet and a lower surface piezoelectric sheet. The upper surface piezoelectric sheet and the lower surface piezoelectric sheet are respectively attached to different sides of the linear beam. The lower end of the linear beam of the combined beam is fixedly arranged between the clamping boss and the clamping ring. A beam end positioning hole is arranged at the lower end of the linear beam. The beam end positioning hole is fixedly connected with the clamping ring through a fastening screw; the upper end of the linear beam is connected with the arc beam. The central mass ball is located between a plurality of the arc beams. Through the combined design of the linear beam and the arc beam, the piezoelectric cantilever beam can not only collect transverse vibration energy, but also collect longitudinal vibration energy.

[0008] Optionally, the energy harvesting circuit includes an energy conditioning circuit board and an energy storage circuit board. An energy storage element is encapsulated on the energy storage circuit board. The input end of the energy conditioning circuit board is electrically connected to the output end of the piezoelectric cantilever beam. The output end of the energy conditioning circuit board is electrically connected to the input end of the energy storage circuit board. The output end of the energy storage circuit board is electrically connected to an external load; both the energy conditioning circuit board and the energy storage circuit board are fixedly arranged on the upper surface of the end cover located below.

[0009] Optionally, snap positioning holes are symmetrically arranged on the base boss of the strip-shaped fixed snap. A cylinder positioning hole is formed on the U-shaped card slot. The cylinder positioning hole and the snap positioning hole are connected by a fastening screw.

[0010] The present invention also provides a working method for an omnidirectional modular piezoelectric energy harvesting system, including the following steps:

[0011] After combining a plurality of piezoelectric energy harvesting modules into a honeycomb-shaped whole, it is fixedly connected to the electromechanical device;

[0012] When the electromechanical device operates and generates vibration, the whole piezoelectric energy harvesting system fixed on the electromechanical device will generate vibration. Furthermore, each piezoelectric energy harvesting module of the piezoelectric energy harvesting system will vibrate. Each piezoelectric cantilever beam of the piezoelectric energy harvesting module is squeezed and deformed to generate electric energy;

[0013] The generated electric energy is rectified and stepped down by the energy conditioning circuit board and then transmitted to the energy storage circuit board. The energy storage circuit board then charges the processed electric energy into the energy storage element for storage. Finally, the electric energy is led outside the shell through the arranged circuit to supply power to the load.

[0014] The present invention has achieved the following technical effects compared with the prior art:

[0015] The structure of the present invention is simple and reasonably designed. By designing a piezoelectric energy harvesting module, the vibration energy generated during the operation of electromechanical devices is converted into electrical energy, realizing the recycling and reuse of energy. It has good practicability and is convenient for wide application. In the present invention, the piezoelectric cantilever beam is designed into a structure combining a linear beam and an arc beam, and the elastic telescopic component is designed into a structure combining a telescopic spring and a mass ball. The piezoelectric cantilever beams are circumferentially arranged around the elastic telescopic component, and through the cooperation of the two, the collection of vibration energy in any direction is realized, effectively overcoming the problems that the existing vibration energy harvesters can only collect energy in a specific direction and have weak environmental adaptability, and improving the efficiency of vibration energy collection. The present invention is provided with strip-shaped fixed buckles, trapezoidal slots and trapezoidal plug boards. The longitudinal movement of the piezoelectric energy harvesting module is restricted by the strip-shaped fixed buckles, and the lateral movement of the piezoelectric energy harvesting module is restricted by the cooperation of the trapezoidal plug board and the trapezoidal slot. Thus, multiple piezoelectric energy harvesting modules can be spliced and disassembled, realizing the modular design of the piezoelectric energy harvesting system. The modular design of the piezoelectric energy harvesting system can not only make the seven piezoelectric energy harvesting modules work independently without affecting each other, but also facilitate disassembly and replacement when a certain piezoelectric energy harvesting module is damaged, with simple maintenance, effectively preventing the overall scrapping of the piezoelectric energy harvesting system due to problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 is the overall structural schematic diagram of the omnidirectional modular piezoelectric energy harvesting system in the present invention;

[0018] Figure 2 is the structural schematic diagram of the cross-section of the omnidirectional piezoelectric energy harvesting module in the present invention;

[0019] Figure 3 is the structural schematic diagram of another perspective of the cross-section of the omnidirectional piezoelectric energy harvesting module in the present invention;

[0020] Figure 4 is the structural schematic diagram of the side wall of the housing of the omnidirectional piezoelectric energy harvesting module in the present invention;

[0021] Figure 5 is the structural schematic diagram of the strip-shaped fixed buckle in the present invention;

[0022] Figure 6 is the structural schematic diagram of the piezoelectric cantilever beam in the present invention;

[0023] Figure 7 is the workflow block diagram of the omnidirectional modular piezoelectric energy harvesting system in the present invention;

[0024] In the figure: 1 - end cap; 2 - wire outlet; 3 - trapezoidal slot; 4 - U-shaped card slot; 5 - cylinder; 6 - telescopic spring; 7 - central mass ball; 8 - clamping boss; 9 - clamping ring; 10 - lead port; 11 - energy conditioning circuit board; 12 - mounting boss; 13 - energy storage circuit board; 14 - upper surface piezoelectric sheet; 15 - lower surface piezoelectric sheet; 16 - linear beam; 17 - arc beam; 18 - buckle positioning hole; 19 - strip fixing buckle; 20 - fastening screw; 21 - wire threading port; 22 - lead groove; 23 - connecting column; 24 - trapezoidal plug board; 25 - beam end positioning hole; 26 - cylinder positioning hole; 27 - energy storage element; 28 - triangular straight hook; 29 - base boss; 30 - piezoelectric energy harvesting module. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] The purpose of the present invention is to provide an omnidirectional modular piezoelectric energy harvesting system and its working method to solve the problems existing in the above-mentioned prior art. Multiple piezoelectric energy harvesting modules can be spliced and disassembled to realize the modular design of the piezoelectric energy harvesting system, which do not affect each other and can work independently after being disassembled and assembled according to different environments.

[0027] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0028] The present invention provides an omnidirectional modular piezoelectric energy harvesting system. The overall structural schematic diagram of the omnidirectional modular piezoelectric energy harvesting system is as Figure 1 shown. Its overall shape is honeycomb-like and is composed of seven omnidirectional piezoelectric energy harvesting modules 30 combined.

[0029] Specifically, the structural schematic diagram of the cross-section of the omnidirectional piezoelectric energy harvesting module in the present invention is as Figure 2 and Figure 3As shown in the figure, the omnidirectional piezoelectric energy harvesting module 30 includes an energy harvesting module housing, an elastic telescopic component, a piezoelectric cantilever beam, and an energy harvesting circuit. Among them, the energy harvesting module housing includes an end cover 1, a cylindrical barrel 5, a mounting boss 12, a top connecting column 23, and a clamping boss 8. The end cover 1 is hexagonal prism-shaped. Two U-shaped card slots 4 are provided on each of the six sides of the top and bottom end covers 1. A trapezoidal slot 3 is also provided on three non-adjacent sides. A mounting boss 12 is provided on the inner surface of the top and bottom end covers 1. A wire passing port 21 is provided on each of the six sides of the mounting boss 12. Two wire outlet ports 2 are provided on the top end cover 1. A connecting column 23 is also provided at the center of the inner surface of the top end cover 1. A clamping boss 8 is provided at the center of the inner surface of the bottom end cover 1. A clamping ring 9 is provided outside the clamping boss 8. A lead outlet 10 is provided on each of the six sides of the clamping ring 9. A cylindrical barrel 5 is provided between the upper end cover 1 and the lower end cover 1. The cylindrical barrel 5 is hollow hexagonal prism-shaped. The top and bottom end covers 1 and the cylindrical barrel 5 are all connected and fixed by fastening screws 20.

[0030] The elastic telescopic component includes a telescopic spring 6 and a central mass ball 7. A relatively deep round hole is provided at the top of the central mass ball 7. The lower end of the telescopic spring 6 is connected and fixed to the central mass ball 7 through the round hole. The upper end of the telescopic spring 6 is connected and fixed to the top end cover 1 through the connecting column 23.

[0031] The omnidirectional piezoelectric energy harvesting module 30 includes six piezoelectric cantilever beams. The piezoelectric cantilever beams are circumferentially distributed around the central mass ball 7. The piezoelectric cantilever beam includes a combined beam and a piezoelectric sheet. Among them, the combined beam includes a linear beam 16 and an arc beam 17. The piezoelectric sheet includes an upper surface piezoelectric sheet 14 and a lower surface piezoelectric sheet 15. The upper end of the combined beam is free. The lower end is placed between the clamping boss 8 and the clamping ring 9. A beam end positioning hole 25 is provided at the lower end of the combined beam. A fastening screw 20 is inserted therein, so as to clamp and fix the combined beam through the fastening screw 20.

[0032] The energy harvesting circuit includes an energy conditioning circuit board 11 and an energy storage circuit board 13. An energy storage element 27 is encapsulated on the energy storage circuit board 13. The energy conditioning circuit board 11 mainly rectifies and steps down the collected electric energy. The energy storage circuit board 13 mainly charges and stores energy for the energy storage element 27. The energy conditioning circuit board 11 and the energy storage circuit board 13 are both placed on the upper surface of the bottom end cover 1 and are connected and fixed to the bottom end cover 1 by fastening screws 20.

[0033] The output wire of the piezoelectric cantilever beam passes through the lead outlet 10 on the side of the clamping ring 9 at the bottom and is first connected to the input end of the energy conditioning circuit board 11 along the end cover 1 at the bottom. After being rectified and stepped down by the energy conditioning circuit board 11, a wire is led out from the output end of the energy conditioning circuit board 11 and connected to the input end of the energy storage circuit board 13. After the energy storage circuit board 13 charges and stores energy in the energy storage element 27, a wire is led out from the output end of the energy storage circuit board 13 and passes into the wire passing port 21 of the mounting boss 12 at the bottom, then passes upward along the wire guiding groove 22 on the inner side of the cylinder 5 into the wire passing port 21 of the mounting boss 12 at the top, and finally passes out of the housing from the wire outlet 2 along the inner surface of the end cover 1 at the top.

[0034] In the present invention, the structural schematic diagram of the side wall of the housing of the omnidirectional piezoelectric energy harvesting module is as Figure 4 shown. The side wall of the housing of the piezoelectric energy harvesting module 30 includes a cylinder 5 and a strip-shaped fixing buckle 19. Wire guiding grooves 22 are provided on all six inner surfaces of the cylinder 5. One trapezoidal slot 3 and two U-shaped slots 4 are provided on each of the three non-adjacent outer surfaces of the cylinder 5. One trapezoidal plug 24 is provided on each of the other three non-adjacent outer surfaces of the cylinder 5. The trapezoidal plug 24 is integrally formed with the cylinder 5. The strip-shaped fixing buckle 19 is vertically installed in each U-shaped slot 4 of the cylinder 5. A gap is reserved between the strip-shaped fixing buckle 19 near both ends and the U-shaped slot 4. Cylinder positioning holes 26 are symmetrically provided on the sides of the cylinder 5, and buckle positioning holes 18 are also symmetrically provided at both ends of the strip-shaped fixing buckle 19. The cylinder 5 and the strip-shaped fixing buckle 19 are connected and fixed by fastening screws 20.

[0035] In the present invention, the structural schematic diagram of the strip-shaped fixing buckle is as Figure 5 shown. The strip-shaped fixing buckle 19 includes triangular straight hooks 28 at both ends and a base boss 29 in the middle. The triangular straight hooks 28 are integrally formed with the base boss 29. Buckle positioning holes 18 for connection are symmetrically provided on the strip-shaped fixing buckle 19.

[0036] The purpose of setting the strip-shaped fixing buckle 19 and the trapezoidal plug 24 in the present invention is: to facilitate the splicing and disassembly of multiple piezoelectric energy harvesting modules 30 in the piezoelectric energy harvesting system. The trapezoidal plug 24 cooperates with the trapezoidal slot 3 to restrict the lateral movement of the piezoelectric energy harvesting module 30, and the strip-shaped fixing buckle is used to restrict the longitudinal movement of the piezoelectric energy harvesting module 30.

[0037] In the present invention, the structural schematic diagram of the piezoelectric cantilever beam is as Figure 6As shown in the figure, the piezoelectric cantilever beam includes a linear beam 16, an arc beam 17, an upper surface piezoelectric sheet 14, and a lower surface piezoelectric sheet 15. The linear beam 16 and the arc beam 17 are integrally formed and are both made of conductive materials. The piezoelectric sheet uses the MFC piezoelectric fiber composite material with strong flexibility, and both the upper surface piezoelectric sheet 14 and the lower surface piezoelectric sheet 15 are arranged in a multi-layer stacked structure. The upper surface piezoelectric sheet 14 and the lower surface piezoelectric sheet 15 are respectively attached to the upper and lower surfaces of the linear beam 16. A beam end positioning hole 25 for connection is provided at the lower end of the linear beam 16.

[0038] In the present invention, the energy conditioning circuit includes six LTC3588-1 chips and their peripheral circuits. The connection method of the six LTC3588-1 chips is in parallel. The parallel connection method can not only make the six branches operate independently without mutual influence, but also increase the output current of the overall circuit, thereby improving the overall output power. The energy conditioning circuit mainly performs rectification, step-down, and voltage regulation operations, converting the alternating current output by the six piezoelectric cantilever beams of the piezoelectric energy harvesting module 30 into direct current that is convenient to process, and then reducing and stabilizing the voltage of the direct current to the required voltage.

[0039] In the present invention, the energy storage circuit includes two LTC4071 chips, two supercapacitors with a voltage of 5.5V and a capacitance of 4F and their peripheral circuits. The connection method of the two LTC4071 chips is in series. The series connection method can increase the voltage of the overall circuit and stabilize the output. The supercapacitor is the energy storage element 27 encapsulated on the energy storage circuit board 13. It has a small volume, fast charge and discharge speed, convenient use, and long service life. The energy storage circuit mainly performs charging and energy storage operations, charging the direct current processed by the energy conditioning circuit into the energy storage element 27, that is, the supercapacitor, and storing it.

[0040] In the all-directional modular piezoelectric energy harvesting system of the present invention, during specific installation, first press the triangular straight hook 28 at the top of the strip-shaped fixing buckle 19 on the housing of the piezoelectric energy harvesting module 30 into the U-shaped card slot 4, and then insert the trapezoidal plug 24 on the housing of another piezoelectric energy harvesting module 30 from top to bottom into the trapezoidal slot 3 on the housing of the first piezoelectric energy harvesting module 30. As the trapezoidal plug 24 is inserted downward, the bottom of the trapezoidal plug 24 will be caught by the triangular straight hook 28 at the bottom of the strip-shaped fixing buckle 19, and the top of the trapezoidal plug 24 will also be caught by the triangular straight hook 28 at the top of the strip-shaped fixing buckle 19, achieving the purpose of longitudinal locking. When the trapezoidal plug 24 is completely inserted into the trapezoidal slot 3, the purpose of lateral locking is achieved. The other five piezoelectric energy harvesting modules 30 are assembled with the first piezoelectric energy harvesting module 30 in the same way as above. After the overall assembly is completed, fix the bottom of the assembled piezoelectric energy harvesting system to the electromechanical equipment to complete all installation work.

[0041] The working process block diagram of the omnidirectional modular piezoelectric energy harvesting system in the present invention is as follows Figure 7 As shown, in terms of the operation of the system, when the electromechanical device operates and generates vibrations, the entire piezoelectric energy harvesting system installed on the electromechanical device will vibrate. Subsequently, each piezoelectric energy harvesting module 30 in the piezoelectric energy harvesting system will vibrate. Then, the vibration will be transmitted to the elastic telescopic component of the piezoelectric energy harvesting module 30, causing the central mass ball 7 to move under the action of the telescopic spring 6. No matter what direction the vibration of the electromechanical device is, the central mass ball 7 will move in the corresponding direction. The movement of the central mass ball 7 will cause longitudinal or transverse extrusion on the piezoelectric cantilever beam, thereby causing the linear beam 16 of the piezoelectric cantilever beam to bend and deform. The piezoelectric sheets 14 attached to the upper surface and the piezoelectric sheets 15 attached to the lower surface of the linear beam 16 will also deform accordingly. Due to the direct piezoelectric effect of the piezoelectric material, the piezoelectric sheets will generate electrical energy. The generated electrical energy is then rectified, stepped down, and regulated by the energy conditioning circuit board 11 and transmitted to the energy storage circuit board 13. The energy storage circuit board 13 then charges the processed electrical energy into the energy storage element 27, that is, the super capacitor, and stores it. Finally, the electrical energy is led outside the shell through the arranged circuit from the wire outlet 2 at the top of the shell to supply power to the load.

[0042] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0043] In the present invention, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, based on the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A full-direction modular piezoelectric energy harvesting system, characterized in that: It includes multiple fixedly connected piezoelectric energy harvesting modules; The piezoelectric energy harvesting module includes an energy harvesting module housing. An elastic telescopic component is arranged inside the energy harvesting module housing. The elastic telescopic component can move when the piezoelectric energy harvesting module is vibrated in any direction. A piezoelectric cantilever beam is arranged on the outer ring of the elastic telescopic component. The piezoelectric sheet of the piezoelectric cantilever beam can deform and generate electric energy when the elastic telescopic component moves. The piezoelectric cantilever beam is electrically connected to an energy harvesting circuit, and the energy harvesting circuit can transmit and store the electric energy generated by the piezoelectric cantilever beam; The energy harvesting module housing includes two end caps arranged symmetrically up and down. A cylinder is fixedly arranged between the two end caps. An installation boss is respectively arranged on the inner surfaces of the two end caps. The two ends of the cylinder are respectively inserted on the installation bosses of the two end caps; A wire passing port is arranged on the side of the installation boss, and two wire outlet ports are arranged on the upper end cap; A connecting column is arranged at the center of the inner surface of the upper end cap, and a clamping boss is arranged at the center of the inner surface of the lower end cap. A clamping ring is arranged outside the clamping boss, and a lead port is arranged on the side of the clamping ring; The elastic telescopic component includes a telescopic spring and a central mass ball. A circular hole is arranged at the top of the central mass ball. The lower end of the telescopic spring is fixedly connected to the central mass ball through the circular hole, and the upper end of the telescopic spring is fixedly connected to the upper end cap through the connecting column; The end cap is a hexagonal prism structure, and the cylinder is a hollow hexagonal prism structure; Six lead grooves are arranged on the six inner surfaces of the cylinder. A trapezoidal slot is arranged on each of the three non-adjacent outer surfaces of the cylinder. Two U-shaped clamping grooves are symmetrically arranged on both sides of the trapezoidal slot. A trapezoidal insertion plate is arranged on each of the other three non-adjacent outer surfaces of the cylinder; A strip-shaped fixed buckle is fixedly installed in the U-shaped clamping groove. The strip-shaped fixed buckle includes triangular straight hooks at both ends and a base boss in the middle. The triangular straight hooks and the base boss are integrally formed, and the base boss is fixedly clamped in the U-shaped clamping groove.

2. The omnidirectional modular piezoelectric energy harvesting system according to claim 1, wherein: The piezoelectric cantilever beams are circumferentially distributed around the central mass ball. The piezoelectric cantilever beam includes a combined beam and a piezoelectric sheet. The combined beam includes a linear beam and an arc beam integrally formed. The piezoelectric sheet includes an upper surface piezoelectric sheet and a lower surface piezoelectric sheet. The upper surface piezoelectric sheet and the lower surface piezoelectric sheet are respectively attached to different sides of the linear beam. The lower end of the linear beam of the combined beam is fixedly arranged between the clamping boss and the clamping ring. A beam end positioning hole is arranged at the lower end of the linear beam. The beam end positioning hole is fixedly connected to the clamping ring through a fastening screw; The upper end of the linear beam is connected to the arc beam, and the central mass ball is located between multiple arc beams.

3. The omnidirectional modular piezoelectric energy harvesting system according to claim 2, wherein: The energy harvesting circuit includes an energy conditioning circuit board and an energy storage circuit board. An energy storage element is encapsulated on the energy storage circuit board. The input end of the energy conditioning circuit board is electrically connected to the output end of the piezoelectric cantilever beam. The output end of the energy conditioning circuit board is electrically connected to the input end of the energy storage circuit board. The output end of the energy storage circuit board is electrically connected to an external load. Both the energy conditioning circuit board and the energy storage circuit board are fixedly arranged on the upper surface of the end cover located below.

4. The omnidirectional modular piezoelectric energy harvesting system according to claim 1, characterized in that: Snap positioning holes are symmetrically arranged on the base boss of the strip-shaped fixed snap. A cylinder positioning hole is formed on the U-shaped card slot. The cylinder positioning hole and the snap positioning hole are connected by fastening screws.

5. A working method of the omnidirectional modular piezoelectric energy harvesting system according to any one of claims 1 to 4, characterized in that: It includes the following steps: After combining multiple piezoelectric energy harvesting modules into a honeycomb-shaped whole, it is fixedly connected to the electromechanical device. When the electromechanical device operates to generate vibration, the entire piezoelectric energy harvesting system fixed on the electromechanical device will generate vibration. Further, each piezoelectric energy harvesting module of the piezoelectric energy harvesting system will vibrate, and each piezoelectric cantilever beam of the piezoelectric energy harvesting module is squeezed and deformed to generate electric energy. The generated electric energy is rectified and stepped down by the energy conditioning circuit board and then transmitted to the energy storage circuit board. The energy storage circuit board then charges the processed electric energy into the energy storage element for storage. Finally, the electric energy is led outside the shell through the arranged circuit to supply power to the load.

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